Safety device



New. 13, 19280 J. B. ROULO SAFETY DEVICE Filed Nc av. 5, 1,927

Patented Nov. 13, 19 28.

-, 1 1,691,130 chiral) STA ES PATENT OFFICE;

101m B. ROULO, OEBEVERLY, MASSACHUSETTS, ASSIGNOR 'ro UNITEDSHQE'MACHiN- any GDRPQEATZON; on mares-son, sensor, A CORPORATION-OF NEWJERSEY.

SAFETY Application filed November This invention relates to safetydevices and particularly to a device for enabling a clutch operated,power driven machine tobe turned over by hand safely while the power ison. y

.ln various kinds of mach'ines it is necessary, in making certa nadjustments and repairs, to turn. the machine over byhand. As

an. example of a machine of this type there may be cited the staplefasten ng machine shown and described in Letters Patentof the UnitedStates No. 1,016,930, grantedlfeb. 13, 1912, on an applicationof WilliamBorden. It is possible, in many machines of the i a repair, then themachine will be driven,

with the consequent chance of injuringithe operator or of damaging themachine or some of its parts.

1n v'ew of the foregoing, the machine shown in said PatentNo. 1,016,930has, in

the past, been provided with a treadle and clutch mechanism by which themachine could be adjusted to run in the usualunannor only when thetreadle is depressed enough to reach the floor. and, when. the operatorwished to adjust or repair the machine, the throw of the clutch engagingmechanism could bechanged bylneans of a convenient hand leverso thatdepression of the treadle to the floor would release the brake withoutengaging the clutch, Th s mechanism hasnot been found entirelysatisfactory in practice because the trcadle mechanism could notbeadjusted until the ma chine was placed in the factory in the position itwas to be run and, if alpicce of leather or other stray material becamefor themachine to run. It has, therefore, become the custom in shoefactories, to adjust the treadle of this machine sothat it is asufficient distance above the floor to prevent the above troublefromoccurring, thus going eht under the treadle, the operatorm e ht, beunable to engage the clutch sufficiently :onvrcn I 5, 1927. Serial No.331,260.

back to the dangerous conditions which might cause the injuries anddamages referred to above. e 1 j i j An object of the present inventionis to provide, in machinesof this type, improved means operable whendesired, to prevent movement of the treadle beyond the point where thebrake is released, thereby enabling the operator to turn the machineover by hand. .Thus the treadle can be so adjusted that it will clearthe floor at alltilnes.

A further object of the invention is to make such means simple and soconstructed that it may be rendered inoperative during the ordinaryoperation of the machine and be conveniently renderedoperative, whendesired, without the use of tools. Another object is to provide a devicefor the above purpose whch may be easily applied to machines in actual.use in factories without making material changes inexisting parts ofsuch machines and preferably so arranged that the safety device maybeoperated by moving its controller'in the same manneras in the case ofthe earlier device but with absolute surety that the clutch will not beencaged, notwithstandingthe positionin which thetrcadle is adjustedabove thefloor level.

The illustrated machine is provided with a continuously driven loosepulley; and the main shaft of the machine is provided with a frictioncone secured thereon. By means of a treadle and wedge mechanism, theloose pulleymay be moved along the shaft so'that a conical face thereonwill come into enga e- .inent with the friction cone andthe machine bedriven through the :loose pulley, thus forming a usual type of clutch.Between the main shaft and the machine frame isja brake mechanism whichisarranged to be set by the power of the machine at a predeterminedpoint in the. operation of the main shaft after the treadle is releasedto bring the machine to rest. Before the movement of the treadleto startthe machine can pro duce engagement of the clutch, a connection s gaged.

of the mechanism and in so adjusting the stop memberthatitwill engagethe slower moving member at the time that the brake is fully releasedbut before the clutch is en In this way depression of the treadle willrelease the brake but the clutch is not and cannot be, engaged. The.ma-.

chine is, therefore, free to be turned over by hand withoutdangeiybecause the treadle cannot be sufficiently depressed to start theFig. 1 is a side elevation, partly n section. of the clutch and brakemechanism of astaple fastenmg machine equipped with the i safety deviceof the present invention. the

safety device being set in a position to permit the machine to be turnedover by hand whenever the treadle rod is depressed;

I Fig. 2 shows the mechanism ofFig. 1 withthe safety device set topermitthe machine to operate in the usual manner;

Fig. 3 is an end'view of the brake mechanism and the/safety device, withthe safety device set for the usual operation of the ma chine the partsbeing shown in stopped posi-- tion with the treadle rod raised and thebrake on;

Fig.4 is a fragmentary view of the parts shown in Fig. 3 which areimmediately associated with the safety device, with the safety devicethrown into operative position but before the treadle rod has beendepressed; and

'Fig. 5 is a View of the parts shown in lwith the safety still inoperative position but after the 'treadle, rod has lmen depressed andthe brake released,' so that the safety device is in position to preventfurther movement of the treadle and permit the machine to be safelyturned over by hand. The illustrated machine 1s provided with a loosepulley 10 which turns on the main shaft 12 of the machine The main shaftleather engages ace-operating cone surface 20.0n the pulley 10. In orderto engage the clutch" the pulley 10, is arranged to slide longitudinallyalong the shaft 12 by means of the usual double wedge mechanism usingthe two wedges 22 and 24. The wedge 22 is arranged to enp'a 'e the)ullev and the wed e u j e a a D of the machine.

This wit draws the stop to a 24 is a part of a member 26 which isconnected to a treadle rod 28 connected to the usual treadle 30' whichis pivoted at 32 on a bracket 34. The treadle is normally revtained inraised position by a spring 36 connected'betwcen the trcadle and a fixed(not shown) of the machine.

Before the clutch can be engaged, it is necessary to release the brakeof the machine. The brake mechanism includes. a brake wheel 38 securedto the mainshaft The brakewheel is engaged by two brake shoes 40 and 42which are connected by a pivot (not shown) at their lower ends. Theoperation of the bral eshoes is controlled by a bell crank lever 44which is mounted on a pivot ll) extending from the machine. The bellcrank lever 44. is pivotally connected to the two brake shoes 4:0 and 42by means of links l5 and 50. n One arm 52 of the bell crank lever l i ispivotally connected by an eccentric part pin (the operation 'of whichwill later, be.

described) with the member 26" which carries the wedge 26L. Thisconnection'is made adjustable by means of thethreaded rod 54. and checknut 56. It will be seen from the above arrangement of parts thatdepression of the treadle 3O depresses the member 26 thereby pulling onthe adjustable connec tion 5st and rotating the bell crank lever elf ina clockwise direction as seen in Figs. 3,

ion

stopat the proper point in the cycle preparatory to a restarting of themachine, an automatic. stop mechanism is provided. Thisconsists of thedownwardly depending arm 58 of the'bell crank 4:411:11 which arm isadjustably mounted a cam roll (30 arranged-to co-operate with a cam 62fixed to the main shaft 12 of the machine. This cam and cam lever are soarranged that when the treadle is released at the time that the cam roll60 is opposite the low part of the cam 62, the spring 36 of the treadlcwill disengage the clutch and then apply the brake by lifting, throughthe treadle connections, the arm 52 of the bell crankwhich will causethe brake shoes to engage the brake wheel 38 and stop the machine. Onthe other hand, when the treadle is released with the cam roll 60opposite the high part of the cam '62, the high part of the cam willmaintain the parts in running condition and will not permit the spring36 to lift the treadle to disengage the clutch and apply by means of asmall handflever 70 projectingradially from the portion 64 of the cocent"16. When the eccentric 1s turned so that the handle 70 is up and. theeccentric portion 68 is down, as shown in Fig. 2, the wedge 24: is moveddownwardly and. the clutch is broughtnearer into engagement so that upondownward movementofthe member 26, and the other parts connected to thetreadle 30, the clutch is brought into engagement soon after the brakeis released. With the handle 70 placed in the downward position so thatthe eccentric portion 68 is in raised position, the wedge 24 is liftedand there is an increased separation between the clutch members and 18.Vhen thus arranged, upon downward mov-mentot the treadle 80, lost motionis encomitcred between the time that the brake is released and theclutch engaged. his arrange ment produces the earlier form of safetydevice in which the treadle was intended to touch the door at the timethe brake is re leased and before the clutch is engaged- Owing todifficulties of adjustment. including irregularity of floor levels infactories and. the varying conditions of the clutch member 18, togetherwith the liability of stray materials becoming lodged on the floor underthe treadle, this arrangement was unsatisfactory. Tl e invention wherebya satisfactory safety device has been pro" duced using the aboveexisting parts with only small additions will now be described.

The large portion 64 of the eccentric is provided with a screw 80 tappedinto it near its outer edge and nearly diametrically opposite theeccentric portion 6.8. From this screw 80 an adjustable connection 82,pivotally connected to the screw, extends diagon ally downward and isthreaded into a stop 84 which is locked in adjusted position by a checknut 85. The stop is slotted to lie on the link 48 but maybe lifted fromthe link for adjustment. When the handle is in raised position (Fig. 3)for ordinary operation of the machine, the stop 84 performs no functionwhatever. hen the handle 70 is brought down so that it rests on the stop84, as in Fig. 4, the stop clears the enlarged portion 86 of the link 48and still performs no function. However, when the treadle depressed withthe handle in the 7 position shown in Fig. 4, the parts assumetheposition shown in Fig. 5, and the stop.

84 abut-s against the enlargement 86 of the link l8 so that no furthermovement of the trcadlecan take place. The'stop is adjusted so that whenthe parts are. in this position, (with the treadle depressed) the brakeis released but the clutch isnot engaged and,

as the treadle can move no farther, there is no possibility of themachine starting and causing injury to the operator or damage to themachine orits parts.

It should be noted that the arrangement of the linkages is suchthat,while downward movement of the "treadle. causes the enlargedportion 86 of the link 48 to move downwardly, in addition to producing asimilar movement of the stop 84, the movemcnt of the part 86 I is slowerthan that of the stop 84 and stop 84 soonovertakes the part 86. Afterthe stop 84 engages the enlargement=86no further movement can takeplace.

It will thus be seen that, by this arrangement,without interfering with.the normal operation of the machine, an effective safety device has beenproduced whereby, when x repairs and adjustments are being made, it isimpossible to engage the clutch and start the machine in operation andthat the treadle adjustments and other adjustments of the parts can bemade where themachine is manufactured before it is putout into thefactory. where the machine is to be used or at anytime thereafter.

In the following claims, reference is made to a-treadle but anv'othersuitable or usual means bywhich an operator may control a machine may besubstituted for the treadle and still come within the scope of theseclaims. 2 i

Having thusdescribed my invention, what I claim as'new and desire tosecure by Letters Patent of the United States is z 1. A safety devicefor a brake and clutch mechanism for preventing operation of the clutchafter the brake has been released, comprising a treadle, and two membersoperatively connected with the treadle to 'move relatively toward eachother upon movement of the treadle and so constructed and arranged thatwhen the members come in justnient of said member.

the treadle and engagement of the clutch are prevented, and means tochange, the

range of movement of one of said members. 3. A satetydevice for a brakeand clutch mechanism for jreventinp' oaeration of the clutch after thebrake" has been-released, comprising a treadle, two members opera-tlvelyconnected with the treadle to move relatively toward each other uponmovement movable to prevent said members from coming in contact duringnormal operation of the machine.

4. A'saietv device fo mechanism forpreven'ting operation of theclutchafter the brake has been released comprising a treadle, twomembers operatively connectedwith the trcadle to move relativelytowardeach other open movement of the treadle and so constructed andZLI'lL- d that when themembers come in contact wi 13h each other'further movement thetreadle and engagement of the clutch are'prevented,and means to permit oneo'ithe members to be taken from its normalposition to allow ada brake and clutch 5. Asatetydevice for a brake andclutch mechanism for preventing operation of the clutch after'the brakehas been released, comprising a treadle, and two members operaitivelyconnected with the treadle to move at different speeds in the samedirection upon movement of the treadle and so constructed and arranged,that when one member overtakes the other they co-act to prevent furthermovement of the treadle and consequent engagement of the clutch. V G. Asafety device for a brake and clutch mechanism for preventing operationof the clutch after the brake'has been released comprising a treadle,two members operatively connected with the treadle to move at. differentspeeds in the'same direction upon movement of the treadle and'soconstructed and arranged that when one'member overtakes the other theyco-act to prevent further movement of the treadle and consequent enandoeine; operative when the controller is in the other position to comeinto contact with said abutment upon depression of the t1ll, saidcontact preventing further t e treadle and'consequent en- .ement Or tr'enient ofthe clutch.

S. A treadle operated: brake and clutch mechanism comprising a clutch abrake drum, a two-piece brake band, a bell crank, 11 'sed'pii'otfor thebell crank links connecthe ends of the brake band with the hell t, anabutment on one of the links an entric onthe bell crank movable-toeither of twoipositions, a stop connected with the eccentric, the stopbeing inoperative when the eccentric is in one position, and beingoperative when the eccentric is in the other position to come intocontact with said abutment upon depression of the treadle, said contactpreventing further movement of the treadle and consequent engagement ofthe clutch.

In testimony whereof I have signed my name to the specification;

JOHN B. noULo.

